If you want to change the Google 2-step Verification for a new device and can access your account, please refer to the following steps:
After logging into the account, click “Account Security”-"Security Settings"-"Google Verification"-"Change":
Enter the Google verification code for the old device or change it to SMS:
After entering the old Google verification code or the SMS verification, you will see the new Google QR code and the key. Before re-binding, please write down the newly obtained secret key as a backup, then scan the QR code with the new device or manually enter the key to re-bind. Enter the newly acquired Google verification code and activate it.
Please note that the Google verification code bound to the old device will be invalid after activation. The key of the modified 2FA has also been updated. The previous secret key is no longer valid.